Infrared study of spin crossover Fe-picolylamine complex
Infrared study of spin crossover Fe-picolylamine complex
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DOI：
10.1143/jpsj.73.1355
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发表时间：
2004-05-01
影响因子：
1.7
通讯作者：
Nanba, T
中科院分区：
文献类型：
--
作者：
Okamura, H;Matsubara, M;Nanba, T
利用红外吸收光谱研究了[Fe（2-吡咯胺）(3)]Cl2EtOH （Fe-pic）在温度和光诱导自旋交叉作用下微观振动态的演变。为了克服单晶样品尺寸小、红外吸收强的缺点，采用了红外同步辐射光源和红外显微镜。得到的Fe-pic的红外光谱在高自旋和低自旋状态之间都有很大的变化，无论是温度诱导的还是光诱导的自旋交叉。相比之下，温度和光致高自旋态的光谱相对相似，但在750cm（-1）以下表现出明显的差异。这表明光诱导的高自旋态与温度诱导的高自旋态具有不同的微观特征。从局部压力和结构变形的角度讨论了这些结果，以及它们可能与Fe-pic中宏观光诱导相的发展有关。
Infrared (IR) absorption spectroscopy has been used to probe the evolution of microscopic vibrational states upon the temperature- and photo-induced spin crossovers in [Fe(2-picolylamine)(3)]Cl2EtOH (Fe-pic). To overcome the small sizes and the strong IR absorption of the single crystal samples used, an IR synchrotron radiation source and an IR microscope have been used. The obtained IR spectra of Fe-pic show large changes between high-spin and low-spin states, for both the temperature- and the photoinduced spin crossovers. In contrast, the spectra in the temperature- and photo-induced high-spin states are relatively similar to each other, however they show distinct differences below 750cm(-1). This demonstrates that the photo-induced high-spin state involves microscopically different characters from those of the temperature-induced high-spin state. The results are discussed in terms of local pressure and structural deformations within the picolylamine ligands, and in terms of their possible relevance to the development of macroscopic photo-induced phase in Fe-pic.